Seasonal variability in inherent optical properties in a western Norwegian fjord

  • Frette Ø
  • Erga S
  • Hamre B
 et al. 
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Abstract

We present measured seasonal variations in the inherent optical properties
(the absorption and scattering coefficients) of water in a deep silled
fjord (Samnangerfjorden) in western Norway. These were based on measurements
taken at monthly intervals during an annual cycle. The measurements
also include concentrations of chlorophyll a and yellow substance,
which were assumed to dominate the behaviour of the absorption and
scattering coefficients. The stations were at three fixed locations,
one being placed in the innermost part of the fjord where there is
little mixing of fjord water with water from the coastal current.
The other two stations were placed at different distances from the
mouth of the fjord, so that the water masses are characterized by
different amounts of mixing between fjord water and coastal current
water. Our data set shows how the absorption and scattering coefficients
vary in a Norwegian fjord during an annual cycle, and how they depend
on the concentrations of chlorophyll a and yellow substance. Values
of the absorption coefficient at 412 nm varied between 0.1 and 2.0
m(-1), and scattering coefficients were also found to vary within
this range. Little variation over the spectral range was found for
the scattering coefficients, but the absorption coefficient had larger
spectral variations. The chlorophyll a concentrations varied from
0.01 to 6.3 mg m(-3), and the concentration of yellow substance,
as expressed by its absorption coefficient at 3 10 nm, was within
the range 0.7-7.8 m(-1).

Author-supplied keywords

  • 5°38-5°44E
  • 60°13-60°23N
  • Fjords
  • Norway
  • Optical properties
  • Phytoplankton
  • Yellow substance

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Authors

  • Svein Rune ErgaUniversity of Bergen, Department of Biology

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  • Øyvind Frette

  • Børge Hamre

  • Jan Aure

  • Jakob J. Stamnes

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